TY  - BOOK
AU  - Kelly,Albert Victor
ED  - Harper & Row Publishers
TI  - Mixed-ability grouping: theory and practice 
SN  - 0063180707
U1  - 371.252 23
PY  - 1978///.
CY  - London: 
PB  - Harper & Row, 
KW  - Mixed ability grouping in education
KW  - Individualized instruction
KW  - Teaching
N1  - Includes bibliography: p. [210]-215 and index
ER  -